There's a story that Bellerophon got his revenge on Stheneboea by taking her for a ride on Pegasus and pushing her off. Be that as it may, the flying horse figured in the hero's own undoing. In later years, Bellerophon was so vain about what he had accomplished that he sought to join the Immortals in their heavenly abode. He was flying up to Mount Olympus when Zeus, angered at his presumption, sent a gadfly to sting Pegasus. The horse threw Bellerophon and he fell to the earth from a great height. For the rest of his days he roamed the land, lame and alone, for no mortal dared befriend him.